Meaning of ACCUMULATOR in English

n ( BrE )

a form of betting on the results of sporting events, usually horse races. If the first bet is won, all the money won is bet on the second event, and all the money from that is bet on the third, etc. If all the bets are won, the person gambling can win a lot of money, but if one bet is lost, everything is lost.

Oxford guide to British and American culture English vocabulary.      Руководство по британской и американской культуре, Оксфордский английский словарь.